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A project proposed a new high efficiency three phase transformer-less photovoltaic (PV) inverter by using super-junction MOSFETs as main power switches. Here fifteen level topologies have been implemented by using H-Bridges. Fundamental switching scheme and Selective Harmonics Elimination were implemented to reduce the Total Harmonics Distortion (THD) value. The proposed inverter can also operate with high frequency by retaining high efficiency which enables reduced cooling system. To reduce the power demands scarcities, to minimize the electromagnetic interferences and to increase the energy efficiency by reducing the number of switches and size of output filter. Multilevel inverters are used to extract the power from solar cells. It also synthesizes the desired AC output waveforms from several dc sources. The simulation result shows the proposed system reduces the power demand scarcity and increase the efficiency using MATLAB/Simulink.
Keywords : Three phase transformer, MOSFET, Multi-level inverters, Total Harmonic Distortion, PMSM motor, PV array
There is an essential need to dry grain quickly and effectively after harvest and before storage to retain maximum quality, to attain a moisture content sufficiently low to minimize infestation by insects and microorganisms (bacteria, fungi, etc.), and to prevent germination. However, maturity of the crop does not always coincide with a suitably dry period. Furthermore, the introduction of high-yielding varieties, irrigation, and improved forming practices has led to the need for alternative drying practices to cope with the increased production, and grain harvested during the wet season as a result of multi-cropping. By using Paddy Drier Processor .In this process we remove dryness is removed by using the heat generation chamber. The hot air is being pumped with the help of the centrifugal pump to the hopper to remove the dryness of the paddy with the help of control value.
Keywords : Centrifugal blower, hopper, control value, applicator, heat exchanger, plate and shell heat exchanger, creo parametric 2.0
This review is intended to provide a critical, up-to-date summary of the field, with particular emphasis on its implications for the application of "anti-oxidant therapy" in periodontal disease. We have reviewed the mechanisms of actions, features, and sources of most common free radicals and reactive oxygen species, as well as analyzed the biological targets for oxidative damage. Based on the direct and indirect anti-oxidant host defenses in relation to the role of polymorph nuclear neutrophils in periodontitis, there is a current evidence for oxidative damage in chronic inflammatory periodontal disease, and the possible therapeutic effects of anti-oxidants in treating and/or preventing such pathology.
Keywords : reactive oxygen species, free radicals, anti-oxidants, polymorph nuclear neutrophils, periodontal disease